Magnetostratigraphy of drill-core SG-1b in the western Qaidam Basin (NE Tibetan Plateau) and tectonic implications

Zhang, Weilin; Appel, Erwin; Fang, Xiaomin; Song, Chunhui; Setzer, Fabian; Herb, Christian; Yan, Maodu

doi:10.1093/gji/ggt439

Cited by 38 publications

(31 citation statements)

References 72 publications

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“…in the interval 2.58-0.78 Ma (core SG-1; Zhang et al, 2012), and ~90 m/m.y. during 2.58-1.6 Ma (core SG-1b; Zhang et al, 2014). The young model yields higher SARs for the lower portion of the core (69.4-130.3 m/m.y.)…”

Section: Discussion Sedimentation Rates In the Ganyanchi Basinmentioning

confidence: 99%

Magnetostratigraphy of the Ganyanchi (Salt Lake) Basin along the Haiyuan fault, northeastern Tibet

Sheng-xue

Cowgill

et al. 2018

Geosphere

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Although Quaternary deposits within the Ganyanchi (Salt Lake) pull-apart basin along the eastern Haiyuan fault preserve a record of both the paleoenvironmental and tectonic evolution of the northeastern Tibetan Plateau, this sedimentary archive has yet to be dated. Here we report a paleomagnetic study of a 328-m-long sediment core drilled near the modern depocenter of the basin, and use this record to both date the onset of sedimentation and reconstruct the depositional history of the basin. The observed magnetic polarity sequence comprises 13 normal and 12 reversed polarity zones, and we explore two possible correlations to the geomagnetic polarity time scale. Our preferred correlation minimizes changes in sedimentation rate and extends from the Brunhes normal polarity chron to the Gauss normal polarity chron. This correlation indicates that the Ganyanchi Basin began to develop by at least ca. 2.76 ± 0.03 Ma. Sediment accumulation rates (SAR) were elevated in two intervals, from ca. 1.92 to 1.78 Ma, when they were ~130.3 m/m.y., and from ca. 0.77 Ma to present, when they were ~234.6 m/m.y. We attribute these enhanced depositional episodes to both Northern Hemisphere cooling and local tectonic effects, with SAR values increasing as the regional climate has shifted toward overall drier and cooler conditions.

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Section: Discussion Sedimentation Rates In the Ganyanchi Basinmentioning

confidence: 99%

Magnetostratigraphy of the Ganyanchi (Salt Lake) Basin along the Haiyuan fault, northeastern Tibet

Sheng-xue

Cowgill

et al. 2018

Geosphere

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“…Dating of the deep borehole SG-1b is mainly based on the detailed paleomagnetic work of Zhang et al (2014). The ages of the samples between identified magnetic polarity chrons were calculated by linear interpolation, assuming a constant sediment accumulation rate within polarity chrons.…”

Section: Material Methods and Chronologymentioning

confidence: 99%

“…The magnetostratigraphy of the SG-1b core is derived fromZhang et al (2014). Heavy black lines represent the five-point running average.…”

mentioning

confidence: 99%

A 7.3–1.6Ma grain size record of interaction between anticline uplift and climate change in the western Qaidam Basin, NE Tibetan Plateau

Yin

Fang

Appel

et al. 2015

Sedimentary Geology

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“…In this study, we focus on the core interval between ~101 and 56 m, which represents a lacustrine sequence mainly composed of mudstones, siltstones, and evaporites (Lu et al, 2015). Paleomagnetic dating constrains the investigated succession to span from ~2.7 to 2.1 Ma (Zhang et al, 2014). This chronology has been further refined by an astronomical tuning (Kaboth‐Bahr et al, 2020).…”

Section: Study Area Material and Chronologymentioning

confidence: 99%

Sedimentological Evidence for Pronounced Glacial‐Interglacial Climate Fluctuations in NE Tibet in the Latest Pliocene to Early Pleistocene

Yin

Dewald

Kaboth‐Bahr

et al. 2020

Paleoceanog and Paleoclimatol

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The intensification of Northern Hemisphere glaciation (iNHG) and uplift of the Tibetan Plateau have been argued to be among the main drivers of climate change in midlatitude Central Asia during the Pliocene/Pleistocene. While most proxy records that support this hypothesis are from regions outside the Tibetan Plateau (such as from the Chinese Loess Plateau), detailed paleoclimatic information for the plateau itself during that time has yet remained elusive. Here we present a temporally highly resolved (~500 years) sedimentological record from the Qaidam Basin situated on the northeastern Tibetan Plateau that shows pronounced glacial-interglacial climate variability during the interval from 2.7 to 2.1 Ma. Glacial (interglacial) intervals are generally characterized by coarser (finer) grain size, minima (maxima) in organic matter content, and maxima (minima) in carbonate content. Comparison of our results with Earth's orbital parameters and proxy records from the Chinese Loess Plateau suggests that the observed climate fluctuations were mainly driven by changes in the Siberian High/East Asian winter monsoon system as a response to the iNHG. They are further proposed to be enhanced by the topography of the Tibetan Plateau and its impact on the position and intensity of the westerlies.Representing the largest continental plateau on Earth, the Tibetan Plateau has a substantial impact on the Earth's climate evolution during the Late

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Magnetostratigraphy of drill-core SG-1b in the western Qaidam Basin (NE Tibetan Plateau) and tectonic implications

Cited by 38 publications

References 72 publications

Magnetostratigraphy of the Ganyanchi (Salt Lake) Basin along the Haiyuan fault, northeastern Tibet

Magnetostratigraphy of the Ganyanchi (Salt Lake) Basin along the Haiyuan fault, northeastern Tibet

A 7.3–1.6Ma grain size record of interaction between anticline uplift and climate change in the western Qaidam Basin, NE Tibetan Plateau

Sedimentological Evidence for Pronounced Glacial‐Interglacial Climate Fluctuations in NE Tibet in the Latest Pliocene to Early Pleistocene

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